This one requires a little funny business on your end. Get an amusing outfit or costume together for yourself and name yourself the "Room Inspector." Gather your kids together and tell them that the inspector is paying their rooms a visit in a half hour, and if the rooms are tidy, it's time for a treat. The 30-mintue timeline is just a suggestion, though. If your children have rooms that are closer to a garbage dump, then you may need to give them some more time. Set a timer and blow your whistle for maximum effect. Your kids should find this pretty exciting and fun. At the end of the time limit, do your best inspector imitation and then dole out the rewards as promised.